FullStory is a digital experience analytics and session replay platform. It records every user interaction—clicks, scrolls, form entries, JavaScript errors—in a video-like replay. Teams use it to diagnose why users abandon carts, why a feature isn't being adopted, or why errors spike on a specific page. Unlike event-based analytics (Google Analytics), FullStory captures the raw session, so you can literally watch users struggle with your interface. The platform integrates with Slack, Jira, Datadog, and Amplitude. You can segment sessions (e.g., "users who clicked the button but didn't submit the form"), build funnels, and set up automated alerts (e.g., "alert me if error rate exceeds 5% in the last hour").